Tap Drill Size Calculator by MakerKiln by MakerKiln

What size drill for an M6 tap? Pick the metric thread and the percent of thread you want, and this gives you the tap drill (the nearest common drill and the exact size) and the clearance hole for the bolt.

• Common coarse metric threads, each with its standard pitch
• Thread engagement from 40% to 100%: 75% is the shop standard
• The nearest drill you can actually buy, and the exact size it stands in for
• The clearance hole for the bolt to pass through

At 75% thread the tap drill is the major diameter minus the pitch: an M6 x 1 takes a 5 mm drill, an M8 x 1.25 takes 6.8. In hard material, drop to 60 or 65% and the tap is far less likely to snap.

Everything is calculated in your browser. Nothing you type is uploaded, and the extension asks for no permissions. It is the same calculator as makerkiln.com/tap-drill-size-calculator.

The "For tapping clean threads" links are Amazon affiliate links: as an Amazon Associate, MakerKiln earns from qualifying purchases. They are labelled as such and open only when clicked.

Privacy: no data collected and no network requests. Privacy policy: https://makerkiln.com/privacy/
Support: https://makerkiln.com/contact/ hello@makerkiln.com